Show on the rise: ABC Family’s “Pretty Little Liars,” Tuesday, 8 p.m. The summer finale hit 10-week highs in total viewers, 18-49s and all of its target female demos, and it was also the most social TV series episode ever, averaging 10,000 tweets per minute.

Show on the decline: History’s “Pawn Stars,” Thursday, 9:30 p.m. The reality show fell 26 percent week-to-week among 25-54s, from 2.37 million to 1.75 million.